Machine for dressing stones.



; Q. MAYER 81 E. SCHELLING.

MACHINE FOR DRESSING STONES.

APPLICATION FILED APR. 9, 1912.

2 SHEETS-SHEET I.

//W I A THE COLUMBIA PLANOGRAI'H c0, WASHINGTON, D. c.

Patented June 20, 1916.

0. MAYER & E. SCHELLING.

MACHINE FOR DRESSING STONES.

APPLICATION FILED APR. 9| I912.

Patented Julie 20, 1916;

2 SHEETS-SHEET 2.

mm uuunnmu 6 man-tn 119 mhass 5= OTTO MAYER, OF Bl j'RGLEN, AND EDMUNDSCI-IELLING, OF ZURICH, SWITZERLAND.

MACHINE FOR. DRESSING STONES.

Specification of Letters Patent.

Patented June 211, 191 6.

Application filed Apii19, 1912. Serial No. 689,642.

To all whom it may concern Be it known that we, OTTO MAYER, a citizen ofthe Swiss Confederation, and residing at Bin-glen, Canton Thurgau,Switzerland, and EDMUND SCHELLING, a citizen of the Swiss Confederation,residing at Zurich, Switzerland, (whose post-office addresses areBiirglen, Canton Thurgau, Switzerland, and 2S Lindenbachstrasse, Zurich,Switzerland,) have invented new and useful Improvements in Machines forDressing Stones, of which the following is a specification.

The invention relates to machines for dressing either natural 'orartificial stones and the object thereof is to provide an improvedmachine of this class which is simple in construction and operation andthe construction of which is such that the machine may be used fordifferent purposes.

The invention is fully disclosed in the following specification of whichthe accompanying drawing forms a part in which the separate parts of ourimprovement are designated by suitable reference characters in ach ofthe views, and in which Figure 1 is an elevational view showing ourimproved machine. Fig. 2 is a top View of the machine with the toolholder and work removed. Fig. 3 shows the carriage with the tool holderin a front view. Fig. 4 shows the tool holder in a sectional view online AB of Fig. 3. Fig. 5 shows a detail. Fig. 6 is a detail sectionalview on the line 6-43 of Fig. 41.

In the drawings A. denotes the stone to be worked upon. The stone A isclamped fast on a carriage B running upon rails C. A device (not shownin the drawings) may be provided to give the carriage automatically areciprocating motion. The arrangement is similar to that of a planingmachine. On both sides of the rails C a standard D is fixed on which acrossguide 1 is slidably mounted. The cross guide 1 is moved up and downin the well known man nor by means of two vertical screws each of whichis provided with a bevel gear 1, the bevel gears of the vertical screwsare in mesh with bevel gears 5 fixed on a horizontal shaft 80. The shaft30 may be rotated by a hand wheel 31 driving a vertical shaft 32 bymeans of bevel gears 8. To insure an easy vertical adjustment the crossguide 1 is connected with two counterweights 33 by means of two steelwire ropes running over pulleys fixed to the standards D. On the crossguide 1 a tool rest 2 is slidably mounted which can be moved along thecross guide by a nut 57 and screw 3. On the tool rest a circular disk 6is rotatably mounted on a pivot fixed to the tool rest. The disk 6 hasworm teeth on its upper edge forming a portion of a worm wheel the teethbeing cut away on the larger part of the circumference. A worm 9rotatably mounted in the tool rest meshes with the teeth on the disk 6.The worm 9 may be rotated by a hand wheel 11. On the disk 6 there aretwo parallel walls 7 between which the tool support 12- is rotatablymounted by means of two trunnions 13 resting in bearings 14 in the walls7. On the tool support 12 two bolts 15 are fixed projecting with theirscrew threaded ends through slots 16 in the wall 7. On each of the boltsa nut 17 with a handle is arranged by means of which the tool supportmay be fixed at any angle with reference to the stone A. A. shaft 27isjournaled in the tool support which is provided with an eccentric 27.On the eccentric 27 a head 27 is arranged having a bore for receiving abolt 27 which is fixed to tool holder and slidably arranged in the borein the head 27*. Between the tool holder and the head we arrange aspring 30.

The tool holder 25 carries a bit 36 and is slidably mounted in a sleeve24 rotatably mounted in a yoke 18 by means of trunnions 23. Thetrunnions 28 of the sleeve 24: pivot in the arms of the yoke 18 andthese arms are provided with integral lugs sliding in slots 21 in thetool support 12. The stem 22 of the yoke 18 forms a nut for the screwthreaded spindle 19 which is rotatably mounted in the tool support 12and carries a bevel wheel 28 meshing with a bevel gear 29 secured to thehand wheel 20, whereby the yoke 18 is moved longitudinally with respectto the tool support 12 by operating the hand wheel 20.

The machine is used as follows: After the stone A is placed in position,the shaft 27 is rotated whereby the tool holder 25 is reciprocated inits axial direction simultaneously swung about its pivots 23. The pathof the cutting edge of the bit is an ellipse the size of which may bealtered by shifting the yoke 18 with reference to the eccentric 27 inthe manner described above. The stone A is now fed below the bit whichcuts regular rows of grooves in the stone if the latter is advanced witha regular speed. If other than the horizontalface of a stone isto beworked upon, the disk 6 is turned to the desired angle. The spring 30serves to cush- 7 ion the strokes. The tool holder is prevented We havedescribed herein thepreferred form of apparatus embodying our invention,but-we wish it understood that various details of construction may bechanged without departing from the spirit of our invention.

We claim:

1. A machine for dressing stones comprising a carriage carrying thestone to be worked upon, an adjustable tool support, a sleeve adjustablymounted in said tool support, a tool holder slidably mounted in saidsleeve, means to shift said sleevein the tool support, aneccentricrotatably mounted in the tool support, and means for rotatingsaid eccentric.

2. A machine for dressing stones comprising a carriage for the stone tobe worked upon, a cross guide adjustable in vertical direction, a toolrest slidably mounted on said cross guide, a pivot on said tool rest, adisk rotatably mounted on said pivot, means to rotate said disk, a toolsupport adjustable on said disk,;a sleeve adjustably mounted in saidtool support, a tool holder slidably mounted in said sleeve, means toshift said sleeve in the tool support, an eccentric rotatably mounted inthe tool support, and means for rotating said eccentric.

In testimony whereof we aflix our signatures in presence of twowitnesses.

OTTO MAYER. EDMUND SCHELLING.

Witnesses:

CARL GUBLER, AUGUST Riincc.

oppies of this patent may be obtained for .five cents each, byaddressingthe Commissioner of Patents,

' Washington, D. 6.

